Year	Measure
1971	0.00804
1972	0.00866
1973	0.00811
1974	0.00719
1975	0.00702
1976	0.00647
1977	0.00513
1978	0.00584
1979	0.00696
1980	0.00868
1981	0.00938
1982	0.0088
1983	0.00998
1984	0.01917
1985	0.02036
1986	0.02164
1987	0.02532
1988	0.02837
1989	0.02547
1990	0.01884
1991	0.02026
1992	0.01953
1993	0.02127
1994	0.02776
1995	0.02582
1996	0.02099
1997	0.01529
1998	0.0187
1999	0.02829
2000	0.02558
2001	0.02532
2002	0.0186
2003	0.01734
2004	0.01959
2005	0.0171
2006	0.02083
2007	0.02063
2008	0.02333
2009	0.02141
2010	0.01959